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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bdde61ad3922efa80a13aeb5a4813c4c0d0b9a4b74d6d5594ef4a4c0d4e211d' 
  AND token = 'DLpU5bpndZoqVjOF+hVjG3Gu2sREfSliNlXHhkSG1E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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