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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0c8119678f958a50703d0d5eb10c0dd7b57113b580727103225d584f9132c0' 
  AND token = 'Vuk9QJaeP5Izwp55cUCuv+HiXpaDPOcP77BcfNDFGsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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