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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01313c96a79f9ed3234502cb897d7291e2e703a1ca2cec7978defbc42186bc37' 
  AND token = '3rcczYPZRuL6xvLjVaQwBGva5L+X9kDn8r1XwODFYjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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