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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a43e46b0ca1df227c751f0417458d15e297f349c711caa855fabe0fc8e62ced9' 
  AND token = 'Xdj8DmwvQc74inKikUzngRl1t3J9zgTXmNEQZzHE59k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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