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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd763004d710c0911327a90cb7748b0ec518eadd8a045ba577c48d00ca679e0c5' 
  AND token = '1x1V1XKO6OoH82PqbmC6VP1TxU6q0woIaFe76Q2i/BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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