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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1717ab67cf8529ec2d9977845dcd39f9ce7269515ba99a4f5d8f3f9d4e33b0' 
  AND token = '1ZwjYEAAshyqRaRW7KopUVsDy9566xqRldC9fcKZfN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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