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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04617c1642d81359e31907336fa1f5e52e8af601eba1a966645c325bd6ee121' 
  AND token = '7fuRO0IhMIFaGY0qyNjUmyy3PI2LYToBhGA5c0fd7fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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