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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0757a6af16cdac1a1e6c2ee6e42ce719626430ac3895add5e65e5ab114f087e4' 
  AND token = 'q6yo8EoGZm2goWSoLemZJvn6SLWMGN8rbtdZdfiqiZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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