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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3710515884fcc29bbef747162570dc235967c89b6a317c28c787c73820cfb6' 
  AND token = 'TgzRhagFQ3Q6nPJzrywe/uyzkOocLugi2QrQL9Tfls4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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