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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948c60aeafa3d7fb05e461de0c389b89c033a821cbd026a6c0789c5d05263d6f' 
  AND token = '0FdM9aS9m4Vq3xx/95WQOtc9Fmo6PRw36uGcHphmX7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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