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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec402dcd74dfe03003c67c227b684f8590ee80805b3736665d86faf70a3939a4' 
  AND token = 'w+Um9grwI1+Er+E50SD9fbOsAqFZ4637CkVHTRDT+Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}