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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9170aff0fe9a9264f876dc345407192ee89a207ff8fcbaf3e9eff1acc8b0df07' 
  AND token = 'B9RtzPoO9t7PGXTkz9zAD9Ut3MXKA2o349zemPSVhAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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