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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d366aa777c0b663feb05f0e622dae922852a62430396f7e80df34e8c7efbd1f' 
  AND token = 'BaG9Ta37peItt9xRSR+2X/v8XR8csK7goWN9Y8lai1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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