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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcd04fd4e3e5495e14632134299ad7c96dff7e0a1b1e1d4bf75b1f7967987f4' 
  AND token = '3Q1Ap2Klyf6/QxZEJD+UJZWRSo8S1UDYeDXKt7IU3C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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