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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd167a99d1712b4ad33df5cd10d7a73f9d4c9f4b21e40f2745f00345d9148c0' 
  AND token = 'iUBd4WV2lXWRyXaUu0tHu8Jj0njccIl4WkowuQy+1Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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