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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b3fdf95bcea6b3f73dec9c8d1621891dc73f79d1ee73502ed50d456223ef67' 
  AND token = '3gw1UPDgQrf0Fy4Z8Ov0ynMZIMWCz59R+o9Omebklpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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