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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03817675e8ccf10bdbf0c3d5fca8fb0da10789efd62ac60383905b7f081930ec' 
  AND token = '6HUlLisRb48JBnnrnRGVqeecBQZN3n+twsMxZgEZZco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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