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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16652f06241915aa1ae30c63e5c9a11e3d44f86df6354b6f529326099238516e' 
  AND token = '+oBjFodFjdzdTdCx84WvJ6wvpXzMi3K4xN3bQVX4eiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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