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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be471274a715fe885378c6f3577f4b44b32e6accc9ea49062b90704726e969e' 
  AND token = 'oXg2nYPn0Bks1y2CT91lzQWkm0qRNLk92nc/ceEG7cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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