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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0287eef78005a019a64e81eba1d73d7cb7ed6ab982e08202a35942ba1ade63' 
  AND token = 'zG4tQa7CLN3ClTbeAgnJnnAZ8PFRiaUuuEaxGlk4QS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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