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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667ae1faf4eb59752d7a41013be555e6b41eef33cff7724acf201d584d3f78c0' 
  AND token = 'jS9hr8WketWy8T28b2PUnrbvJ0tmrb7qTXhpw3iT0gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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