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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d7248a1d8f6784443ad21705036db7de7ce90f0dec0c9b77ec342a94858d64' 
  AND token = 'FhawuZgmqnbnMolPst6g4nOhgZjeW4DhhYfL5T5lX2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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