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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0e2ac498c4a96c4dbf0851198822592665a9a9c05916893fde2a6d0bf5d174' 
  AND token = '8otSG5dc+1bEOeevRIhpvGx1zydcCtDsYzkjxOCXCFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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