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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60b71e696f219353e3c271eef26bd13a03dcc37ac89ba5f0670bb8c825d200f' 
  AND token = 'cbgiJQQslnoLxXoM1vMVU7C2xUr1fV24muI7sazWX1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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