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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85208bf50bde36be60a956a9b09b5fbb1e8250710d704fc238be8b129ea72ac' 
  AND token = 'Zu9lBalgHlmdNvZEAaaDifK2q0yug3Gg0++nL8M2zfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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