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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323f8a8bb634b43f7a279e2fba2e101a7494642130c96d9f477f068ba340734c' 
  AND token = '4f6bFrm8gGvGFT05NoJP8TdfzpsmRKpUiu+WWOWor+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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