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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a98334199621fb8c500149180c32c732a899307d269b8553a193665aac712f' 
  AND token = 'OaeOOI+HHDkaQTcCuv0p/rnMUOf8zW8rVlO0LnfmnB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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