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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50869db83ce46601f59f4b6b22621cb545d251970796fc8a30a8fa34b980faa' 
  AND token = 'kr3iSx/M5mpSvLIJCDI8NcVsI/KxL3IvMEToYbeYFvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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