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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92315adaa45857f61e8c0d176cdab1c858ee7955fb5d2c8be1cb06b2721faf65' 
  AND token = 'qokAol27wUY0EgyQzoA5nycZyVQt47Shs7Et7iq6KPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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