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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5268e7f206bf7ca0dc6a09c21183f48fed1cf79333a5a35c1ef4578ead290d8f' 
  AND token = '/23IFCx0TB3cdf91rWbuWHCEcIJKlVxAxtiQnrwz5Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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