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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3101a916ad33a658af916d6dbf9a58dd159cf0c2165c407aae35840c0a98c9d' 
  AND token = 'dmHxbIhg2NK6iq9XK3V455Bbbq9HiphYo3QuEUnZfpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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