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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024e967ff2447d8e7289be1be5eaebfe4c6d130117cedcc274ffd6e34e432c19' 
  AND token = 'hQbSUpJdAPEMApG9xKf0lUoNfYe5dY/zUvNbAG2iNPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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