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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b1b42d6a8acee9f9f0325fc5dde73612207db52f24c066543dfe897843571b' 
  AND token = 'qgTABtf8dWFAlJaE1Or4JPyIwqc2Wm3NJDOyAsRUJ6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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