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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada0ecf88b6863b7007a26d598dc87d6459076a8fdcfda02c54b0e6aaf579e79' 
  AND token = 'Us6QvzfaJiaa3pP8HAYK0bV8/AfG5kkPyA/peLiZCJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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