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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acccabe72a0671cbc50ee973a21e724882cae6101f363e132756af8dc64a8ea2' 
  AND token = 'y39W92zWUsaPz+RaEnvWHvgNy77cilA5jqH3GpoFjKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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