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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff770b9bbb5dddb991d8cfe8037796d7b4dda7ade4eb84a2486a5381bcde9961' 
  AND token = 'g8SwLBehs1KxcAhKsn7ct5+AyjTBInk+YhNBNHR+tGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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