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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32eccc725c88b339c6181481bc6f29eb63b7f5500f0df9d65dbcf0577256655a' 
  AND token = '2KT5m/J5yr3iKyDXpGpMnU6Pvsp/5k2uMyffC0QqAAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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