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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9660077174d699a8aaf87f68bcbbb2e6b0c15a8c7e1d796c2f977df901bcda0c' 
  AND token = 'PQXwnQOgExeH9Ad259KDA35fDRLwwQK8zfJ0nIaVFE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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