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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54b98d4dd748553c2c1f81612bd6ae480b11b46d99941b595d8dd2885fedf55' 
  AND token = '7tbyJ10p5bSWEe8lBAXK7LsTKk+ncLhxm7I09y2nhMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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