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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc5e9e28ddb17ed40ba8cb78129ebb8a240fea3fea18d430498e6b4b326ef2e' 
  AND token = '1a60suRvMv3+be/W/6x8yqKaT5MomZSRF8OpBzTsegg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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