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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c6a79f5104ec08fc271c2ae765bf2f75a7b034ad7bd94f5a89000a2d94b140' 
  AND token = 'LnKuP1Kbihh9t7ftwb3jAJ6aXc4th3NgbIPBMklC5TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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