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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aca45abc52d6f1ca1de59ae71445e0c039ec58d156eeb35c7991a1bdf3d0e6a' 
  AND token = 'DFFW3K39S1Ty/BQFKvcVLeLpqYFWWRKfkDj2OvB8eXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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