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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb11dd93981b7908b796aaa1b8abe736d10c8c8fec38fa7b76d8b15d4c760b91' 
  AND token = 'kGkvQUpnkuUz4G/F/2yirSPIvlK876t/kIGw2LzKvps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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