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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994b89bd42ec7f8807f72c7192a049e5f74393c12f6bb5107c735adb69106000' 
  AND token = '1eXV9/biw84arlasJ57hEOmPve4XPDGhYKcSdFcSR6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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