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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf46a7b404557bea6e6196541e674a367594f8703689de7d94875f7db710ed9' 
  AND token = 'M9BzyWJVTH3kZ7YJ5t/PxV45bwzvlxO4nerhI2ZyMFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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