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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af992b5f22bfcd512248718456d97983ab435213f0f6585c8e2382b0279c9840' 
  AND token = '8BebX3fifXc184ysR9BI1AqhErWX0YMsIK6D8pA28Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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