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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5713b6ab035fae46b076d4a951de4b250cc94ce2d2176ffc4ba6a7f1ab8713a6' 
  AND token = 'iH+PMP5S8pPIXZFXG37t4aq+4hDgo1baCK7eh/gkMDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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