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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044d2a7c694373af2dd15f1e21f0cdfbc7f428e361010c4f3060d16e90336b93' 
  AND token = '5YjcQdzeY3E7Lak25kapsujTQU7a6ln6r0g/KCTIcsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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