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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e862dc398b3ae6315077dfd14bfb5871ab559a5af027f72f6ed87af6303eddb' 
  AND token = 'L5Vwfx6Y8DYpEoXm3USAJBnWp40NoT3u+RR9dcKRvd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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