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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee8dff8fa2e5db16ef0bdf847fe41e550ff32b0520eb705927f052907b33dab' 
  AND token = 'xZq4Q82ft6dK3pBakqyFvOZNd4k/0CkKOkejGjiCcKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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