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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d26ac1e28fc4e21171c0131de7541238c7bb34829a17cd979ee0c6b6bbba86' 
  AND token = '0dqJaGrXy/w/Ff2OnyX8IRqXsW1McWp42K14WlwNw5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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