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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f213dd0a9ab03cd90d285c3a6803db06e30e6681509cfc92b585f7a7ff204d' 
  AND token = 'aC+G+850/PDI6WPachCrBMsm6JiPdxjt5HGc3C9xVp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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