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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cc775cdb73636b2150ce1c7797538467c6ee113dd9feb9c166a992ccae8ca0' 
  AND token = 'ZnIyNJCzpRBGC7eqK0+xeIQfGQuMaStUz9vEo+h7/dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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