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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed8c29883e5699dc03078a7fc873884a0957e8a2441dbdba4d3ea8eef3b189c' 
  AND token = 'WvX+6zRHkgXrU0P997Uzwnq8KfM/l1uEi9wpqK19i0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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