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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a0a845add7fe5cc10bcef41c94aa76d0b0c2f00ccd7ccd4b7ecc3d38a97608' 
  AND token = 'Xi8PinibMPGrr1TgEhI7VE2u0IqcF/avUZJew+c1ZMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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