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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c8a806cf5c8efc222b0ddf70d7b8350d7e4bd95a716174806a12604c941e22' 
  AND token = 'KRVNAPWXjn2NXGmqHkMQR4idS1g80I8CSbLi1tvf33c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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