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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2faa4bbdcc507568496ea5c650e6cbeb492119c573e92a515cf11f75ad685b' 
  AND token = '7jJP18ipMucslyTHTaYsLbRFGfwnTATczX/29UzPJ70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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