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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd8720b0c800e59cc9018e0267713b5c3b82d35f663595d539f731ace01ac39' 
  AND token = 'jiHfqY66pyrQUxF7SzFyAKZsPQcTivQgsF7RgBXKR3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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