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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879fa2408b004744637f1830e7be15b26eaeb4ea413dad9571ab5ae285dd9054' 
  AND token = 'lg82R1oVC3i39Z5T/AKntrHCnO3gl2o6TsY4NCsO+RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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