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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9701b7e9b3e3cda087d8b8f1f69fe690fcb70f52f1de600b5f71f8e3c57c6ca5' 
  AND token = 'Xxev6oV8qA/jgJIL9uAZANiVoVp7NDgta3xPHdFaQAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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